Microplastics in the Great Lakes: Becoming benthic; Science Daily (09-23-2019)From the Great Pacific garbage patch to inland rivers, plastics are among the most widespread contaminants on Earth. Microplastics — particles of plastic smaller than five millimeters — are especially pervasive. As they build up in Earth’s waters, microplastics are also becoming a permanent part of the planet’s sedimentary layers…